gnu: osc: Update to 0.165.0.

* gnu/packages/build-tools.scm (osc): Update to 0.165.0.
[source]: Use git-fetch.
[arguments]: Use python3. osc_hotshot.py is gone. So, do not attempt to delete
it. Rename fix-filename-and-remove-unused phase to fix-filename phase.
[inputs]: Add rpm. Remove python2-urlgrabber. Replace python2-m2crypto and
python2-pycurl with python-m2crypto and python-pycurl.

Signed-off-by: Arun Isaac <arunisaac@systemreboot.net>